difficult to say amar, its like asking is the F word used in -ve or +ve sense? the word is in itself not +ve or -ve but how and what context one says, i can use F word with friends in a +ve way and with someone else in -ve sense..
similarly with cunning, i have used it with friends in a +ve way, and said it in -ve way too...it alll implies to you...
Take another example Is fission reaction+ve or -ve? Can't say right? as it depends how you use it..for making electricity or destroying a nation...
same here...
hope it clarifies the idea...

Thanx for the clarification... but each word will be used in one sense more often than other i.e. "In general"...I will put the question in another way... if you have used cunning 10 times... how many times would it have been in negative...